website appear blank

hello,
hope anybody or somebody can help me. I'm new in joomla. and i used ispconfig as my server. My platform is joomla 1.7. last day, my site appear blank sudently. i didnt now why. Mayb my joomla was problem. I'm trying install the same joomla in another server (VMWARE) and it's work. its is because server or my joomla..

yup.. notng problemn with joomla.. in ispconfig, another joomla can run as well. but my joomla not work. when i move to wmware server. it's work. i realy didnt know wat going on. my joomla was prob or ispconfig. but my joomlaalready running in isconfig around 2 week already.. what the matter its happen after 2 week on live..? so confius..